Influence of Marine Feeding Area on Lipid Accumulation in Juvenile Coho Salmon
The succession of seasons is accompanied by predictable changes in the environment. In general, food production increases in the spring to reach a maximum during summer, and then declines in the fall before reaching minimal values during winter. Hence, fish often face food shortages during winter an...
| Main Authors: | , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.6255 http://www.npafc.org/new/publications/Technical Report/TR6/page 94-95(Trudel).pdf |
| Summary: | The succession of seasons is accompanied by predictable changes in the environment. In general, food production increases in the spring to reach a maximum during summer, and then declines in the fall before reaching minimal values during winter. Hence, fish often face food shortages during winter and must rely on the reserves accumulated during summer to fuel their metabolic functions. As the duration of winter increases with latitude in the northern hemisphere, fish living at the northern end of their distribution must accumulate higher lipid reserves during the growing season to survive over winter (Conover and Present 1990). Here, we tested the hypothesis that lipid accumulation in Pacific salmon increases with latitude during summer. Juvenile coho salmon (Oncorhynchus kisutch) were collected in the Eastern Bering Sea (BS), in southeastern Alaska (SEA), and on the west coast of Vancouver Island (WCVI) using a rope trawl in September–November 2002–2003 (Fig. 1). Growth rates of juvenile coho salmon were estimated assuming that WCVI, SEA, and BS coho smolts migrated to sea at an average size of 100 mm on May 1, May 15, and June 1, respectively, as coho smolts |
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